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Empressite

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Formula:
AgTe
System:
Orthorhombic
Colour:
light bronze
Lustre:
Metallic
Hardness:
3 - 3½
Name:
For the type locality, the Empress Josephine Mine, Colorado.
Related to stützite.

Classification of Empressite

Approved
2.CB.80

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.
2.8.25.

2 : SULFIDES
8 : AmXp, with m:p = 1:1
3.2.6

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
2 : Sulphides etc. of Ag
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First Recorded Occurrence of Empressite

Year of Discovery:
1914

Occurrences of Empressite

Geological Setting:
Low temperature, gold poor, hydrothermal veins

Physical Properties of Empressite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
light bronze
Comment:
Tarnishes darker bronze
Streak:
grey-black to black
Hardness (Mohs):
3 - 3½
Hardness (Vickers):
VHN25=135 - 151 kg/mm2
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
7.61 g/cm3 (Measured)    7.61 g/cm3 (Calculated)

Crystallography of Empressite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 8.90Å, b = 20.07Å, c = 4.62Å
Ratio:
a:b:c = 0.443 : 1 : 0.23
Unit Cell Volume:
V 825.24 ų (Calculated from Unit Cell)
Z:
16
Morphology:
Compact granular masses, rarely in crystals

Optical Data of Empressite

Type:
Anisotropic
Anisotropism:
strong - gray to yellowish white to grasyish blue
Bireflectance:
moderate to strong
Colour in reflected light:
greyish white
Pleochroism:
Strong
Comments:
Gray to creamy white

Chemical Properties of Empressite

Formula:
AgTe
Essential elements:
All elements listed in formula:
Common Impurities:
Pb,Cu,Fe,S

Relationship of Empressite to other Species

2.CB.05aColoradoiteHgTe
2.CB.05aHawleyiteCdS
2.CB.05aMetacinnabarHgS
2.CB.05cPolhemusite(Zn,Hg)S
2.CB.05bSakuraiite(Cu,Zn,Fe)3(In,Sn)S4
2.CB.05aSphaleriteZnS
2.CB.05aStilleiteZnSe
2.CB.05aTiemanniteHgSe
2.CB.05UM1998-15-S:CuFeZnCu2Fe3Zn5S10
2.CB.05aRudashevskyite(Fe,Zn)S
2.CB.10aChalcopyriteCuFeS2
2.CB.10aEskeborniteCuFeSe2
2.CB.10aGalliteCuGaS2
2.CB.10bHaycockiteCu4Fe5S8
2.CB.10aLenaiteAgFeS2
2.CB.10bMooihoekiteCu9Fe9S16
2.CB.10bPutoraniteCu9(Fe,Ni)9S16
2.CB.10aRoquesiteCuInS2
2.CB.10bTalnakhiteCu9(Fe,Ni)8S16
2.CB.10aLaforêtiteAgInS2
2.CB.15aČernýiteCu2(Cd,Zn,Fe)SnS4
2.CB.15aFerrokësteriteCu2(Fe,Zn)SnS4
2.CB.15aHocartiteAg2(Fe2+,Zn)SnS4
2.CB.15aIdaiteCu5FeS6
2.CB.15aKësteriteCu2(Zn,Fe)SnS4
2.CB.15aKuramiteCu3SnS4
2.CB.15bMohiteCu2SnS3
2.CB.15aPirquitasiteAg2ZnSnS4
2.CB.15aStanniteCu2(Fe,Zn)SnS4
2.CB.15cStannoiditeCu6+Cu22+(Fe2+,Zn)3Sn2S12
2.CB.15aVelikiteCu2HgSnS4
2.CB.15cUM2006-11-S:CuFeGeZnCu8(Fe,Zn)3Ge2S12 (?)
2.CB.20ChatkaliteCu6FeSn2S8
2.CB.20MawsoniteCu6Fe2SnS8
2.CB.30ColusiteCu26V2(As,Sn,Sb)6S32
2.CB.30GermaniteCu13Fe2Ge2S16
2.CB.30GermanocolusiteCu26V2(Ge,As)6S32
2.CB.30NekrasoviteCu26V2(Sn,As,Sb)6S32
2.CB.30StibiocolusiteCu13V4(Sb,Sn,As)3S16
2.CB.30Ovamboite Cu20(Fe,Cu,Zn)6W2Ge6S32
2.CB.30MaikainiteCu20(Fe,Cu)6Mo2Ge6S32
2.CB.35aHemusiteCu6SnMoS8
2.CB.35aKiddcreekiteCu6SnWS8
2.CB.35aPolkovicite(Fe,Pb)3(Ge,Fe)1-xS4
2.CB.35aRenierite(Cu,Zn)11(Ge,As)2Fe4S16
2.CB.35aVincienniteCu7+Cu32+Fe22+Fe23+Sn(As,Sb)S16
2.CB.35aMorozeviczite(Pb,Fe)3Ge1-xS4
2.CB.35bCatamarcaiteCu6GeWS8
2.CB.40LautiteCuAsS
2.CB.45CadmoseliteCdSe
2.CB.45GreenockiteCdS
2.CB.45Wurtzite(Zn,Fe)S
2.CB.45RambergiteMnS
2.CB.45Buseckite(Fe,Zn,Mn)S
2.CB.55aCubaniteCuFe2S3
2.CB.55bIsocubaniteCuFe2S3
2.CB.60PicotpauliteTlFe2S3
2.CB.60RaguiniteTlFeS2
2.CB.65ArgentopyriteAgFe2S3
2.CB.65SternbergiteAgFe2S3
2.CB.70SulvaniteCu3VS4
2.CB.75VulcaniteCuTe
2.CB.85MuthmanniteAuAgTe2
3.2.1AcanthiteAg2S
3.2.3NaumanniteAg2Se
3.2.4AguilariteAg4SeS
3.2.5HessiteAg2Te
3.2.7StütziteAg5-xTe3, x = 0.24-0.36
3.2.8CervelleiteAg4TeS
3.2.9DervilliteAg2AsS2
3.2.10StromeyeriteAgCuS
3.2.11MckinstryiteAg5-xCu3+xS4
3.2.12JalpaiteAg3CuS2
3.2.13EucairiteAgCuSe
3.2.14CameroniteCu5-x(Cu,Ag)3+xTe10 (x = 0.43)
3.2.15Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40
3.2.16SternbergiteAgFe2S3
3.2.17ArgentopyriteAgFe2S3
3.2.18Geffroyite(Cu,Fe,Ag)9(Se,S)8
3.2.19ArgentopentlanditeAg(Fe,Ni)8S8

Other Names for Empressite

Name in Other Languages:
German:Empressit
Simplified Chinese: 粒碲银矿
Spanish:Empressita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Empressite

Reference List:
Bradley (1914), American Journal of Science: 38: 163.

Schaller (1914), Washington Academy of Science Journal: 4: 497.

Bradley (1915), American Journal of Science: 39: 223.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 260.

Thompson, R.M., M.A. Peacock, J.F. Rowland, and L.G. Berry (1951): Empressite and “stuetzite”. Am. Mineral., 36, 458-469.

Honea, R.M. (1964) Empressite and stuetzite redefined. American Mineralogist 49, 325-328.

Cabri, L.J. (1965) Discussion of “empressite and stuetzite redefined” by R.M. Honea. Am. Mineral., 50, 795-801.

Stumpfl, E.F. and J. Rucklidge (1968) New data on natural phases in the system Ag–Te. American Mineralogist 53, 1513–1522.

Criddle, A.J. and C.J. Stanley, Editors. (1993) Quantitative data file for ore minerals, 3rd ed. Chapman & Hall, London, 154.

Bindi, L., P.G. Spry, and C. Cipriani (2004) Empressite, AgTe, from the Empress-Josephine mine, Colorado, U.S.A.: composition, physical properties, and determinatioon of the crystal structure. American Mineralogist 89, 1043-1047.

Internet Links for Empressite

Localities for Empressite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Armenia
 
  • Kotayk' Province
    • Hrazdan
Kovalenker, V. A., Zalibekyan, M. A., Laputina, I. P., Malov, V. S., Sandomirskaya, S. M., Garas' ko, M. I., & Mkhitaryan, D. I. (1990). Sulfide-telluride mineralization of the Megradzor ore field, Armenia. International Geology Review, 32(7), 705-720.
Bulgaria
 
  • Sofiya Oblast (Sofia Oblast)
    • Zlatitsa Obshtina
      • Zlatitsa
K. Bogdanov, A. Filipov, R. Kehayov (2005): Au-Ag-Te-Se minerals in the Elatsite porphyry-copper deposit, Bulgaria. Geochemistry, Mineralogy and Petrology, 43, 13-19.
Canada
 
  • British Columbia
    • Skeena Mining Division
      • Pitman
R. M. Thompson (1954) Mineral occurrences in Western Canada. American Mineralogist 39:525-528
  • Ontario
    • Sudbury District
      • Levack Township
Canadian Mineralogist Vol. 17, pp.275-285 (1979); Ames, D.E., Kjarsgaard, I.M., and Douma, S.L., 2003, Sudbury Ni-Cu-PGE Ore Mineralogy Compilation: Sudbury Targeted Geoscience Initiative (TGI): Geological Survey of Canada, Open File 1787
      • MacLennan Township
Ames, D.E., Kjarsgaard, I.M., and Douma, S.L., (2003), Sudbury Ni-Cu-PGE Ore Mineralogy Compilation: Sudbury Targeted Geoscience Initiative (TGI): Geological Survey of Canada, Open File 1787
China
 
  • Hebei Province
    • Chengde Prefecture
      • Xinglong Co.
Yingfu Zhao and Zengyao Lu (2004): Mineral Resources and Geology 18(3), 212-216
  • Hunan Province
    • Chenzhou Prefecture
      • Guiyang Co.
        • Huangshaping Pb-Zn-polymetallic ore field
Weining Zhou (1994): Mineral Resources and Geology 8(4), 233-244; American Mineralogist 89, 1043-1047
  • Jilin Province (Manchuria; Dongbei Region)
    • Yanbian Chaoxianzu Autonomous Prefecture
      • Helong Co.
Huanchun Duan and Shirong Zhu (1997): Mineral Resources and Geology 11(3), 199-204
Fiji
 
  • Viti Levu
    • Tavua Gold Field
      • Vatukoula
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Econ Geol (1987) 82:345-370
Finland
 
  • Lapland Region
    • Sodankylä
mutanen Tapani 1997. Geology and ore petrology of Akanvaara nd Koitelainen mafic layered intrusions and the Keivitsa -satovaara layered complex, Northern Finland. Geological Survey of Finland, bulletin 395. 233s.
Greece
 
  • Thraki Department (Thrace; Thracia)
    • Évros Prefecture
      • Alexandroupoli (Alexandroupolis)
        • Pefka
Repstock, A. (2011): Ore mineralogical investigation of the Au, Ag, Te, Cu, Pb, Zn-bearing epithermal veins at Pefka mine, western Thrace, northeastern Greece. Unpubl. Diploma Thesis, University of Hamburg, Germany, 97 pp. (in German).
Japan
 
  • Honshu Island
    • Chubu Region
      • Shizuoka Prefecture
        • Shimoda City
          • Rendaiji
Takasu (1965) Kobutsu-Gaku Zasshi (Journal of the Mineralogical Society of Japan), 7, 350-355.; Int Geol Congr (2008) Oslo. MRD-09
Norway
 
  • Nordland
    • Fauske
      • Sulitjelma
        • Sulitjelma Cu Mines
Cook, N. J. (1996): Mineralogy of the sulphide deposits at Sulitjelma, northern Norway. Ore Geology Reviews 11: 303-308
Poland
 
  • Podlaskie
    • Suwałki District
Nejbert K. 2008: Mineralogy of sulphides in mafic rocks of the Suwałki Anorthosite Massif, NE Poland. Mineralogia - Special Papers, vol. 32, p. 116
Romania
 
  • Hunedoara Co.
    • Brad
Singer, D.A., Berger, V.I., and Moring, B.C. (2008): US Geological Survey Open-File Report 2008-1155.
    • Deva
www.minerals-of-the-carpathians,2009
South Korea
 
  • Gyeongsangnam-do (Kyongsang-namdo)
Econ Geol (1990) 85:1114-1132
Sweden
 
  • Värmland
    • Arvika
      • Glava
Cook, N. J.,Ciobanu, C.L.& Danushevskiy, L, (2007): LA-ICP-MS determination of gold in Bi-chalcogenides from four deposits in the Fennoscandian Shield. Geological Survey of Finland, Guide 53, 23-30; Bonev, I. K., Petrunov, R., Cook, N. J., & Ciobanu, C. L. (2005). Kostovite and its argentian varieties: Deposits and mineral associations. Geochem. Mineral. Petrol.(Bulg. Acad. Sci.), 42, 1-22.
Switzerland
 
  • Wallis (Valais)
    • Goms
      • Furka pass area
        • Furka
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 177.
Turkey
 
  • Marmara Region
    • Balikesir Province
      • Ayvalık
Oyman, T. (2010): Geochemistry, mineralogy and genesis of the Ayazmant Fe–Cu skarn deposit in Ayvalik, (Balikesir), Turkey. Ore Geology Reviews 37, 175-201.
USA
 
  • Arizona
    • Cochise Co.
      • Tombstone Hills
        • Tombstone District
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 212.; Williams, S. (1980). Schieffelinite, a new lead tellurate-sulphate from Tombstone, Arizona. Mineralogical Magazine, 43(330), 771-773.
  • Colorado
    • Boulder Co.
      • Gold Hill District
Minerals of Colorado (1997) E.B. Eckels
American Mineralogist (1949) 34:341-382
Minerals of Colorado (1997) Eckels, E. B.
      • Magnolia District
In the collection of Brent Thorne.
      • Sugarloaf District
Minerals of Colorado (1997) Eckels, E. B.
    • Saguache Co.
      • Bonanza District (Kerber Creek District)
        • Bonanza
Am Min 49 (1964), 325; American Mineralogist (1930) 15: 272-273
Minerals of Colorado (1997) Eckels, E. B.
  • Washington
    • Chelan Co.
      • Wenatchee District
        • Wenatchee
          • Squillchuck Creek
Lasmanis, R. (1995): Mineral News: A Compendium of Wenatchee District Mineralogy, Chelan County, Washington, p.6-7
Uzbekistan
 
  • Tashkent Viloyati (Toshkent)
    • Angren Region
      • Chatkal-Kuraminskii Range
Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Dmitriy I. Belakovskiy (2003): New Data on Minerals: 38: 101-112.; Evseev, A. A. (1995) Kazaknstan and Middle Asia. A brief Mineralogical Guide. World of Stone 8:24-30
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